The constitutional convention was a meeting intended to revise and improve the articles of confederation
James Madison, founder father, 4th president of the U.S.
Thomas Jefferson, founder father, 3rd president of the U.S.
This meeting took place in Philadelphia
The Constitutional Convention took place at the end of May 1787 through September of the same year when it went from "Grand Convention" to "Constitutional Convention".
The Constitutional Convention was important because issues of the weak central government like representation in Congress, slavery and the new executive branch of the government were discussed during this meeting.